March 2026 · Assessment
Diagnostic testing identifies WHAT students know and don't know, not just their overall level. While a placement test tells you "This student is B1," a diagnostic test reveals "This student is B1 overall but has A2-level grammar, B2-level reading, and B1 vocabulary." This granular information is gold for targeted, efficient teaching.
| Type | Question Answered | Detail Level | When |
|---|---|---|---|
| Placement | "What level is this student?" | Low — one overall score | Start of course |
| Diagnostic | "What are their specific strengths and gaps?" | High — per skill/area | After placement, periodically |
| Proficiency | "Can they function at this level?" | Medium — standardized | Certification |
Test specific structures at appropriate levels. Don't just test "grammar" — break it down: verb tenses (present, past, future), articles, prepositions, conditionals, passive voice, relative clauses. Score each area separately.
Test vocabulary breadth (how many words) and depth (how well they know them). Include: topic-specific vocabulary, collocations, word formation, and register awareness. Use a mix of recognition (multiple choice) and production (gap-fill) tasks.
Use texts at the student's approximate level. Test: gist reading, scanning for details, inference, understanding vocabulary from context, and identifying text structure. Different skills may be at different levels.
Include various accents and speaking speeds. Test: gist listening, specific information, speaker attitude, and note-taking ability. AI-generated listening exercises can create level-specific diagnostic materials.
Use structured tasks: picture description, role-play, discussion question, opinion sharing. Evaluate separately: fluency, accuracy, range, pronunciation, and interaction skills.
Ask for a short writing sample (100–150 words) on a familiar topic. Analyze: grammar accuracy, vocabulary range, coherence, task achievement, and spelling/punctuation.
Beyond language skills, understand why and how students need English:
Edooqoo's Welcome Placement Test provides a 49-question AI assessment covering grammar, vocabulary, reading, listening, and speaking. It generates a detailed learner profile with CEFR-tagged scores per skill area — exactly the diagnostic data needed for personalized teaching.
A comprehensive diagnostic covering all skills: 45–60 minutes. For a quick diagnostic of one area (e.g., grammar only): 15–20 minutes. Balance thoroughness with student fatigue — you can spread diagnostic testing over two sessions.
For intensive courses: every 4–6 weeks. For regular weekly lessons: every 2–3 months. After a significant teaching block focused on a specific area, re-diagnose that area to measure progress and decide whether to move on or continue.